Işık University (Turkish: Işık Üniversitesi) is a private university located in Istanbul, Turkey. The university is a part of the (Feyziye Schools Foundation Işık Schools) Feyziye Mektepleri Vakfi Isik Okulları which was established by the Feyz-i Sıbyan School in the city of Salonica on 14 December 1885 (now Thessaloniki).